Thermal Stability Improvement of Cr3+-Activated Broadband Near-Infrared Phosphors via State Population Optimization

被引：83

作者：

Zhang, Qiuhong ^{[1
]}

Wei, Xiang ^{[1
,2
]}

Zhou, Jianbang ^{[1
]}

Milicevic, Bojana ^{[3
]}

Lin, Litian ^{[1
]}

Huo, Jiansheng ^{[1
]}

Li, Junhao ^{[1
]}

Ni, Haiyong ^{[1
]}

Xia, Zhiguo ^{[4
]}

机构：

[1] Guangdong Acad Sci, Inst Resources Utilizat & Rare Earth Dev, State Key Lab Rare Met Separat & Comprehens Utiliz, Guangdong Prov Key Lab Rare Earth Dev & Applicat, Guangzhou 510651, Peoples R China

[2] Guangdong Univ Technol, Sch Chem Engn & Light Ind, Guangzhou 510006, Peoples R China

[3] Univ Belgrade, Vinca Insitute Nucl Sci, Ctr Excellence Photoconvers, Natl Inst Republ Serbia, POB 522, Belgrade 11001, Serbia

[4] South China Univ Technol, Sch Phys & Optoelect, State Key Lab Luminescent Mat & Devices, Guangdong Prov Key Lab Fiber Laser Mat & Appl Tech, Guangzhou 510641, Peoples R China

来源：

ADVANCED OPTICAL MATERIALS | 2023年 / 11卷 / 14期

基金：

中国国家自然科学基金;

关键词：

Cr3+; thermal stability; near-infrared phosphors; photoluminescence; EMISSION;

D O I：

10.1002/adom.202300310

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Technological progress has accelerated the researches into broadband near-infrared (NIR) luminescent materials as next-generation intelligent NIR light sources; however, poor thermal stability restricts the applications of NIR phosphors. Herein, new insights into Cr3+-activated NIR phosphors with improved thermal stability are provided. The photoluminescence intensity originating from the 4T2 -> 4A2 broadband emission of CaLu2Al4SiO12:Cr3+ (CLAS:Cr) with optimal electron occupation (T-4(2)/E-2) increases up to 118% at 475 K compared with that at room temperature, which is the best for Cr3+-activated broadband NIR phosphor. Accordingly, new ideas for the design of thermally stable phosphors are proposed by optimizing the thermal population between T-4(2) and E-2 states and electron migration from E-2 to T-4(2) state. Finally, multifunctional applications of CLAS:Cr in NIR fluorescence intensity ratio thermometry, X-ray detection, NIR phosphor-converted light-emitting diodes, and bio-imaging are demonstrated.

引用

页数：8

共 46 条

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